Pump jack



Feb. 11, 1936. w CUMWNS 2,@30,282

PUMP JACK 7 Filed Aug. 4, 1954 2 Sheets-Sheet 1 86 8 9 INVENTOR.

W. E. UMM/NS.

Feb. 11, 1936. w. E, CUMMINS 2,030,232

' PUMP JACK Filed Aug. 4, 1954 2 Sheets-Sheet 2 INVENTOR.

W E. CUMM/A/J.

Patented Feb. 11, 1936 UNITED STTS i A'i'. HQ

11 Claims.

This invention relates to improvements in pump jacks.

The general object of the invention is to provide a long stroke pump jack of novel construction.

Another object of the invention is to provide a pump jack wherein the jerk on the polish rod at the end of each stroke is eliminated.

A further object of the invention is to provide a pump jack which when disconnected from its associated polish rod is completely portable.

Other objects and the advantages of this invention will be apparent from the following description taken in connection with the accompanying drawings wherein:

Fig. 1 is an end View of my improved pump jack showing it operatively installed on an oil well derrick;

Fig. 2 is a fragmentary side View of the pump jack;

Fig. 3 is an enlarged fragmentary vertical section through the device;

Fig. 4 is a section taken on line 44 of Fig. 3;

Fig. 5 is a section taken on line 5-5 of Fig. 3;

Fig. 6 is a section taken on line 6-45 of Fig. 3 on a reduced scale;

Fig. '7' is an enlarged fragmentary side elevation of the supporting sleeve member;

Fig. 8 is a top plan view of the parts shown in Fig. '7; and,

Fig. 9 is a fragmentary view similar to Fig. 3 showing the stroke adjusting collar.

Referring to the drawings by reference characters I have indicated my improved pump jack generally at IU. As shown the device It includes a frame portion 82 which is supported by rollers l3 which operate on spaced tracks l4 provided on the floor of an oil well derrick l5.

Mounted on the frame I2 I provide a bowl portion l6 which includes side walls I1 and a bottom l8. The open top of the bowl I6 is shown as closed by a cover member 19 and in the bottom l8 of the bowl I provide a threaded aperture 2! Extending downward from the bowl I6 I provide a hollow well portion 2! which includes side 7 walls 22. and a bottom 23 having an aperture 24 therein and concentric with the aperture 2 3 I provide a packing gland 25. The upper end of the well portion 2i is threaded as at 26 to engage the threads of the aperture 2E3 of the bowl l6.

Adjacent the upper end of the bowl I6 I provide an outwardly extending flange portion 2? to which the cover I9 is secured by bolts 28 and nuts 29.

The cover i9 includes an upwardly extending hub portion 29 having an aperture 39 therein which is concentric with the aperture 28 in the bottom of the bowl.

Extending upwardly from the cover 59 I pro"- vide a hollow guard member M which includes side walls 32 and a top wall 33 having a pair of spaced apertures 34 therein. The lower portion of the guard 3| fits around the cover hub 29 and is shown as secured thereto by bolts 35.

Positioned in the bowl I6 I provide a supporting sleeve member which includes an outwardly extending flange 3? at its lower end and has an aperture 38 therein which is concentric with the bowl aperture 26. In the lower surface of the flange 31 I provide a ball race 38 and concentric therewith in the upper face of the bowl bottom I8 I provide a similar ball race Positioned in the ball races 39 and 40 I provide a plurality of steel balls M which rotatably support the sleeve 36.

Surrounding the sleeve 35 adjacent the flange in I provide a bevelled ring gear 52 which is free from the sleeve and has the teeth thereof facing upward. In the lower face of the ring gear 42 I provide a ball race 43 and in the upper face of the sleeve flange 37 I provide a coaxial ball race 44. Positioned in the ball races "53 and I provide a plurality of steel balls 45 which rotatably support the ring gear 42 on the sleeve flange 31.

Surrounding the sleeve 3'6 above the ring gear 42 I provide a clutch collar 46 which is shown as secured to the sleeve 36 by a key M. In the lower face of the clutch collar 65 I provide a recess '23 and in the upper face of the clutch collar I provide a similar recess 49.

Adjacent the upper face of the clutch collar 46 I provide a bevelled ring gear 56 which like the ring gear 42 surrounds the sleeve 36 and is free from the sleeve. The teeth of the ring gear 50 face downward. In the upper face of the ring gear 50 I provide a ball race 5 l Secured to the cover I9 by bolts 52 and depending therefrom I provide a bearing collar 53 having a ball race 54 in the lower face thereof which is concentric with the ball race 5! of the ring gear 5i 45 Positioned in the ball races 5! and the ball race 54 I provide a plurality of steel balls 55.

Positioned in the aperture 38 of the sleeve 35 I provide a square threaded stem 5% having an aperture 51 therethrough. At its upper end the 50 stem 56 extends above the sleeve 36 and includes a reduced threaded hub 53 by means of which a cap member 59 is secured to the stem. The lower portion of the stem 56 extends downward and at its lower end the stem includes a reduced threaded hub 60, by means of which a disk member 6| is secured to the stem.

To prevent the stem 56 from turning a pair of opposed keys 32 are secured to the side walls 22 of the well 2i as by rivets 63. The keys 62 are positioned in recesses 64 provided in the stem disk 3! (see Figs. 3 and 5).

Mounted on the sleeve 35 I provide a plurality of pins 35 having frusto-conical rollers 66 rotatably mounted thereon. The pins 35 and rollers 33 extend radially towards the center of the sleeve aperture 38 and are arranged in spiral form to conform to the spiral of the stem thread and the rollers 68 fit in between the threads of the stem. Thus it will be seen that when the sleeve 33 is rotated the rollers 36 will force the stem 53 to move either upward or downward depending on the direction the sleeve is rotated.

Positioned in an aperture 37 in the bowl I5 I provide a drive housing 38 which is shown as secured to the bowl by bolts 39. Mounted in the housing 33 I provide an anti-friction roller bearing it! having a shaft H journalled therein. The shaft ii extends into the bowl !5 and has a beveled gear i2 secured thereto which meshes with both the ring gear 42 and the ring gear 53. Secured adjacent the opposite end of the shaft H I provide a worm gear 73 which meshes with a worm pinion l4 secured to the armature shaft E5 of an electric motor 16. Positioned in the recess @3 of the clutch collar 46 I provide a clutch ring H which is split as indicated at 18 (see Fig. 6).

Secured to the ring gear 50 I provide a downwardly extending pin :9 which is positioned between the ends of the clutch ring Tl. Adjacent one end of the clutch ring H I provide an enlarged portion 853 having an inwardly tapered cam face 8! Positioned in the recess 43 of the clutch collar 66 I provide a clutch ring 82 which is similar to the clutch ring T! and the like parts thereof are indicated by similarly primed reference numerals.

Positioned in a vertical recess 84 in the sleeve 36 I provide a clutch operating bar 35. The bar 85 is vertically movable in the recess 84 and intermediate its length includes an outwardly extending enlarged cam portion 85 which is vertically movable in a recess 8'! provided in the clutch collar 43.

Rotatably mounted on the bar 85 adjacent the upper end thereof I provide a roller 83 which extends above the upper end of the bar and rotatably mounted on the bar 35 adjacent its lower end I provide a similar roller 33 which extends below the lower end of the bar.

When the bar 85 is moved upward as shown in Fig. 3 and the ring gears are rotating the cam portion 86 of the bar engages the cam face 8! of the clutch ring Ti and as the clutchring is being rotated in the same direction as the ring gear 5 by the pin E3 the cam face 8! will jam against the cam portion 83 of the bar 35 thereby rotating the sleeve 36 in the same direction as the ring gear 50. When the sleeve 35' is thus rotated it will through the medium of the rollers 55 thereon move the stem 56 upward.

When the bar 85 is moved downward the cam portion 85 thereof will engage the cam face 85 of the clutch ring 82 and will actuate the sleeve 33 in the same direction as the ring gear 42 as previously described in connection with the clutch ring ll. When the sleeve 33 is thus rotated it will through the medium of the rollers 65 thereon move the stem 56 downward.

The clutch operating bar 85 is shown as supported by a pair of opposed arms 90 (see Figs. '7 and 8). One end of each arm 93 is positioned in a recess 3| provided in the bar 85 and the opposite end of the arm terminates in a ball portion 92 which is positioned in an aperture 93 provided in an arm 54 which is integral with the sleeve 36 and extends therefrom. The ball portion 92 extends out of the aperture 93 slightly and is engaged by a spring arm 95 which is secured to the sleeve 33 by a bolt 96.

When the stem 56 approaches the limit of its downward travel the cap member 53 thereon engages the roller 38 of the clutch operating bar 85 and as it continues to move downward it moves the bar 85 downward thereby moving the cam portion 85 of the bar out of engagement with the clutch ring Ti and into engagement with the clutch ring 82 whereupon the direction of rotation of the sleeve 36 is reversed, as previously described.

When the stem 56 approaches the limit of its upward travel the disk member 3! thereon engages the roller 39 of the clutch operating bar 35 and as it continues to move upward it moves the bar 85 upward thereby moving the cam portion 85 of the bar out of engagement with the clutch ring 82 and into engagement with the clutch ring if whereupon the direction of rotation of the sleeve 36 is reversed, as previously described. For lubricating the device 50 the bowl l6 and the well 2| are preferably filled with oil.

When the device I is used in combination with an oil well, as shown, the polish rod 3! which operates the oil well pump extends into the well through the packing gland 25 and is positioned in the aperture of the stem 56. The polish rod 9! extends above the cap member 59 and a clamp member 93 is firmly secured to the polish rod by bolts 99 and nuts I00, (see Fig. i). The clamp member 98 rests on the cap 59 thus the polish rod 91 is supported by the stem 55 and as the stem travels up or down the polish rod travels with it thereby operating the oil well pump.

For controlling the weight of the polish rod 9'! I may provide a frame liil which is supported on the bowl !6 and includes four spaced upright members Hi2. Mounted to slide verti cally on each pair of uprights I32 I provide weighted member I03. Mounted on the frame :92 above the upper end of the dust cap 3! I provide a pair of spaced pulleys HM.

Each of the weighted members m3 have one end of a cable 35 secured thereto which extends upward over the pulleys I and then downward and into the dust cap 3! through the apertures 34 therein. The opposite ends of the cables 105 include eyelet portions I66 which engage hook portions Ili'l integral with the cap member 59.

In Fig. 9 I have shown a collar member i353 which is used to adjust the travel of the stem 56 when the full travel thereof is not desired. The collar I39 includes a central aperture H3 in which the stem 56 is positioned. The collar I39 further includes a radially extending threaded aperture H2 in which a threaded plug H3 is positioned. The plug I I3 includes a reduced stem portion M4 on which a frusto-conical member I i5 is positioned.

When the collar N39 is used it is positioned on the stem 53 at the desired distance below the cap member 59 and thereafter the threaded plug H3 is ghtened to force the conical memher I! into tight engagement with the adjacent threads of the stem 56. Thereafter, when the stem 56 moves downward the collar I09 engages the roller 88 of the clutch operating bar 85 instead of the cap member 59 as previously described.

For retaining the device H1 in an operative position coaxial with the polish rod 91 I have shown two pairs of standards H6 which are mounted on the derrick floor, one pair adjacent each end of the frame l2 outside of the rails I4. Extending across the track from one standard H6 to the other I provide an angle iron IH which is suitably secured to the standards. Each of the angle irons II! are shown as removably secured to the frame l2 by bolts I I8 and nuts I I9.

In use as the disks 6| move upwardly oil passes below this disk through the recesses 54 and when the disk moves downwardly the oil again passes through the recesses 64 and this in effect provides a dash pot construction whereby jar is eliminated.

From the foregoing description it will be apparent that I have provided a novel long-stroke pump jack which is simple in construction and highly efiicient in operation.

Having thus described my invention, I claim:

1. In a pump jack, a supporting frame, a well on said frame, a bowl arranged above and communicating with said well, a cover on said bowl, a guard on said cover, said guard being hollow and said cover having a hole affording communication between the guard and the bowl, a sleeve in said bowl, anti-friction means to support said sleeve for rotation, a bevel gear mounted to rotate on said sleeve and having upwardly irected teeth thereon, a second bevel gear spaced from said first bevel gear and mounted to rotate on said sleeve and having downwardly directed teeth thereon, anti-friction means to support said bevel gears, a clutch housing between said bevel gears, said clutch housing including a portion keyed to said sleeve, a drive gear in constant mesh with both of said bevel gears, a pair of clutch members in said clutch housing, one of said clutch members coacting with said lower bevel gear to clutch said low-er bevel gear to the sleeve and the other clutch member serving to clutch the upper bevel gear to the sleeve, a threaded stem disposed in said well and said bowl and movable into and out of said cover, thread members in said sleeve engaging the threads of said threaded stem, said threaded stem having a disk thereon at the lower end thereof movable in said well, means to prevent rotation of said disk and said threaded member, said last mentioned means being disposed in said well, a cap on the upper end of said threaded member, a counter-weight attached to said cap, a clutch actuating member slidably mounted in said clutch housing, said clutch actuating member projecting beyond the clutch housing at each end thereof and having a roller at each end, said clutch operating member when in raised position being adapted to clutch said upper bevel gear to said sleeve and when in lowered position being adapted to clutch the lower bevel gear to said sleeve, the upper roller of said clutch actuating member when in upper position engaging said cap to shift the clutch actuating member. and the lower roller on said clutch actuating member when in lowered position engaging said disk to shift the clutch actuating member.

2. In a pump jack, a supporting frame, a well on said frame, a bowl arranged above and communicating with said well, a cover on said bowl,

said clutch housing including a portion keyed to said sleeve, a drive gear; in constant mesh with both of said bevel gears, a pair of clutch members in said clutch housing, one of said clutch members coacting with said lower bevel gear to clutch said lower bevel gear to the sleeve and the other clutch member serving to clutch the upper bevel gear to the sleeve, a threaded stem disposed in said well and said bowl and movable into and out of said cover, threaded members in said sleeve engaging the threads of said threaded member, said threaded stem having a disk thereon at the lower end thereof movable in said well, means to prevent rotation of said disk and said threaded member, a cap on the upper end of said threaded member, a clutch actuating'member mounted in said clutch housing, said clutch actuating member projecting beyond the clutch housing at each end thereof, said clutch operating member when in raised position being adapmd to clutch said upper bevel gear to said sleeve and when in lowered position being adapted to clutch the lower beveled gear to said sleeve, the upper end of said clutch actuating member when in upper position engaging said cap to shift the clutch actuating member and the lower end on said clutch actuating member when in lowered position engaging said disk to shift the clutch actuating member.

3. In a pump jack, a supporting frame, a rotatable sleeve on said frame, a pair of independent oppositely facing gears mounted to rotate on said sleeve, means to drive said gears in opposite directions, a clutch means operative to selectively clutch either of said pair of gears to said sleeve, a threaded stem disposed in said sleeve and threaded means in said sleeve located between said gears and engaging the threads of said stem.

4. In a pump jack, a supporting frame, a sleeve rotatable in said frame, a pair of gears mounted to rotate on said sleeve, means to drive said gears in opposite directions, a clutch housing, said clutch housing including a portion keyed to said sleeve, a pair of clutch members in said clutch housing, one of said clutch members coacting with one. of said gearsto clutch said one gear to the sleeve and the other clutch member serving to clutch the other gear to the sleeve, a threaded stem disposed in said sleeve, threaded means in said sleeve engaging the threads of said threaded stem, a clutch actuating member slidably mounted in said clutch housing, said clutch actuating member projecting beyond the clutch housing at each end thereof and having a roller at each end, said clutch operating member when in raised position being adapted to clutch said upper bevel gear to said sleeve and when in lowered position being adapted to clutch the lower bevel gear to said sleeve.

5. In a pump jack, a supporting frame, a sleeve on said frame, anti-friction means to support said sleeve for rotation, a gear mounted to rotate on said sleeve and having upwardly directed teeth thereon, a second gear spaced from said first bevel gear and mounted to rotate on said sleeve and having downwardly directed teeth thereon, a drive gear for both of said first two gears, a clutch between said gears, said clutch including a portion keyed to said sleeve and a pair of clutch members, one of said clutch members coacting with said lower gear to clutch said lower gear to the sleeve and the other clutch member serving to clutch the upper gear to the sleeve, a threaded stem, threaded means in said sleeve engaging the threads of said threaded stem, and a clutch actuating member adapted when in raised position to clutch said upper gear to said sleeve and when in lowered position being adapted to clutch the lower gear to said sleeve.

6. In a pump jack, a supporting frame, a well on said frame, a bowl arranged above and communicating with said well, a cover on said bowl, a guard on said cover, said guard being hollow and said cover having a hole affording communication between the guard and the bowl, a sleeve in said bowl, anti-friction means to support said sleeve for rotation, a bevel gear mounted to rotate on said sleeve and having upwardly directed teeth thereon, a second bevel gear spaced from said first bevel gear and mounted to rotate on said sleeve and having downwardly directed teeth thereon, a clutch housing, said clutch housing including a portion keyed to said sleeve, a drive gear in constant mesh with both of said bevel gears, a pair of clutch members in said clutch housing, one of said clutch members coacting with said lower bevel gear to clutch said lower bevel gear to the sleeve and the other clutch member serving to clutch the upper bevel gear to the sleeve, means to operate said clutch members, a threaded stem disposed in said well and said bowl and movable into and out of said cover and threaded means in said sleeve engaging the threads of said threaded member.

'7. In a pump jack, a supporting frame, a well on said frame, a bowl arranged above and communicating with said well, a sleeve in said bowl, anti-friction means to support said sleeve for rotation, a bevelled gear mounted to rotate on said sleeve and having upwardly directed teeth thereon, a second bevel gear spaced from said first bevel gear and mounted to rotate on said sleeve and having downwardly directed teeth thereon,

a clutch housing, said clutch housing including a portion keyed to said sleeve, a drive gear in constant mesh with both of said bevel gears, a pair of clutch members in said clutch housing, one of said clutch members coacting with said lower bevel gear to clutch said lower bevel gear to the sleeve and the other clutch member serving to clutch the upper bevel gear to the sleeve, means to operate said clutch members, a threaded stem disposed in said well and said bowl and movable into and out of said cover and threaded means in said sleeve engaging the threads of said threaded member.

8. In a pump jack, a supporting frame, a sleeve rotatable on said frame, a pair of, gears mounted to rotate on said sleeve, means to drive said gears in opposite directions, a clutch housing, said clutch housing including a portion keyed to said sleeve, a pair of clutch members in said clutch housing, one of said clutch members coacting with one of said gears to clutch said one gear to the sleeve and the other clutch member serving to clutch the other gear to the sleeve, a threaded stem disposed in said sleeve, threaded means in said sleeve engaging the threads of said threaded stem, said threadedstem having a disk thereon at the lower end thereof, means to prevent rotation of said disk and said threaded member, a cap on the upper end of said threaded member, a clutch actuating member projecting beyond the clutch housing at each end thereof and having a roller at each end, said clutch operating member when in raised position being adapted to clutch said upper bevel gear to said sleeve and when in lowered position being adapted to clutch the lower bevel gear to said sleeve, the upper roller of said clutch actuating member when in upper position engaging said cap to shift the clutch actuating member and the lower roller on said clutch actuating member when in lowered position engaging the disk to shift the clutch actuating member.

9. In a pump jack, a supporting frame, a sleeve on said frame, anti-friction means to support said sleeve for rotation, a gear mounted to rotate on said sleeve and having upwardly directed teeth thereon, a second gear spaced from said first gear and mounted to rotate on said sleeve and having downwardly directed teeth thereon, a clutch housing between said bevel gears, said clutch housing including a portion keyed to said sleeve, a drive gear in constant mesh with both of said first gears, a pair of clutch members in said clutch housing, one of said clutch members coacting with said lower bevel gear to clutch said lower bevel gear to the sleeve and the other clutch member serving to clutch the upper bevel gear to the sleeve, a threaded stem, threaded members in said sleeve engaging the threads of said threaded stem, said threaded stem having a disk thereon at the lower end thereof movable in said well, means to prevent rotation of said disk and said threaded member, said last mentioned means being disposed in said well, a cap on the upper end of said threaded member, a clutch actuating member slidably mounted in said clutch housing, said clutch actuating member projecting beyond the clutch housing at each end thereof said clutch operating member when in raised position being adapted to clutch said upper bevel gear to said sleeve and when in lowered position being adapted to clutch the lower bevel gear to said sleeve.

10. In a pump jack, a supporting frame, a well on said frame, a bowl arranged above and communicating with said well, a sleeve in said bowl, anti-friction means to support said sleeve for rotation, a bevelled gear mounted to rotate on said sleeve and having upwardly directed teeth thereon, a second bevel gear spaced from said first bevel gear and mounted to rotate on said sleeve and having downwardly directed teeth thereon,

a clutch housing, said clutch housing including a portion keyed to said sleeve, a drive gear in constant mesh with both of said bevel gears, a pair of clutch members in said clutch housing, one of said members coacting with said lower bevel gear to clutch said lower bevel gear to the sleeve and the other clutch member serving to clutch the upper bevel gear to the sleeve, a threaded stem disposed in said well and said bowl, threaded members in said sleeve engaging the threads of said threaded member, said threaded stem having a disk thereon at the lower end thereof movable in said well, means to prevent rotation of said disk and said threaded member, a cap on the upper end of said threaded member, a clutch actuating member mounted in said clutch hous- I ing, said clutch actuating member projecting beyond the clutch housing at each end thereof, said clutch operating member when in raised position being adapted to clutch said upper bevel gear to said sleeve and when in lowered position being adapted to clutch the lower beveled gear to said sleeve, the upper end of said clutch actuating member when in upper position engaging said cap to shift the clutch actuating member' and the lower end on said clutch actuating member when in lowered position engaging said disk to shift the clutch actuating member.

11. In a pump jack, a supporting frame, a well on said frame, a bowl arranged above and communicating with said well, a sleeve in said bowl, anti-friction means to support said sleeve for rotation, a bevel gear mounted to rotate on said sleeve and having upwardly directed teeth thereon, a second bevel gear spaced from said first bevel gear and mounted to rotate on said sleeve and having downwardly directed teeth thereon, antifriction means to support said bevel gears, a clutch housing between said bevel gears, said clutch housing including a portion keyed to said sleeve, a drive gear in constant mesh with both of said bevel gears, a pair of clutch members in said clutch housing, one of said clutch members acting with said lower bevel gear to clutch said lower bevel gear to the sleeve and the other clutch member serving to clutch the upper bevel gear to the sleeve, a threaded stem disposed in said well, threaded members in said sleeve engaging the threads of said threaded stem, said threaded stem having a disk thereon at the lower end thereof movable in said well, means to prevent rotation of said disk and said threaded member, said last mentioned means being disposed in said well, a cap on the upper end of said threaded member, a clutch actuating member slidably mounted in said clutch housing, said clutch actuating member projecting beyond the clutch housing at each end thereof and having a roller at each end, said clutch operating member when in raised position being adapted to clutch said upper bevel gear to said sleeve and when in lowered position being adapted to clutch the lower bevel gear to said sleeve, the upper roller of said clutch actuating member when in upper position engaging said cap to shift the clutch actuating member when in lowered position engaging said disk to shift the clutch actuating member.

WALTER E. CUMMINS. 

